Product Description
The CMT OMM21-X1 1-1/8" Sharp Corner Scraper is a high-carbon steel oscillating accessory designed for multi-material cutting and scraping tasks using a universal arbor mount. Built for precision work in tight corners and along edges, this sharp corner blade handles soft expansion joints, window putty and sealing compounds, and insulation materials - making it a go-to attachment for tradespeople who need clean, controlled cuts in confined spaces. The 28mm blade width and 2-inch cutting height give users a consistent reach into corners where standard blades cannot perform, while the universal arbor ensures broad compatibility across most oscillating multi-tool platforms.
Key Features
- 28mm Sharp Corner Blade Geometry - the precise corner profile concentrates cutting force directly into 90-degree joints and edges, delivering cleaner results than wider or rounded scrapers in tight spaces.
- Universal Arbor Mount - fits most oscillating multi-cutters on the market, meaning one blade works across multiple tool brands without adapters, saving time on the job.
- High-Carbon Steel (HCS) Construction - provides the hardness and edge retention needed to cut through soft expansion joint material, window putty, sealing compound, and insulation without rapid dulling.
- 2-Inch Cutting Height - allows the blade to reach deeper into joint channels and thicker material layers, reducing the need for multiple passes and improving work efficiency.
- Multi-Material Capability - purpose-built for soft expansion joints, sealing compounds, and insulation materials, so a single scraper replaces several specialty tools for these tasks.
- Sold as a 1-Piece Unit - gives users the flexibility to purchase exactly the quantity needed, whether as a replacement or as an addition to an existing blade set.
Why This Product
- The sharp corner geometry targets work that flat or radius scrapers simply cannot reach - expansion joints, window putty lines, and insulated corner seams all benefit from a blade shaped specifically for 90-degree access.
- The universal arbor design means this CMT blade drops into most oscillating multi-tool setups without hunting for a proprietary adapter, keeping downtime low when swapping accessories mid-job.
- High-carbon steel construction balances sharpness with durability, making this scraper well-matched to the soft-to-medium materials listed in its rated applications - cutting insulation and sealing compound without the overkill of a bi-metal or carbide blade.
- At 1-1/8 inch (28mm) wide with a 2-inch cutting height, this blade covers a practical working area for corner scraping tasks while remaining narrow enough to stay within joint boundaries without damaging adjacent surfaces.
Specifications
- Manufacturer Part Number: OMM21-X1
- Brand: CMT Orange Tools
- Blade Width: 1-1/8" (28mm)
- Cutting Height: 2"
- Blade Material: High-Carbon Steel (HCS)
- Blade Style: Sharp Corner Scraper
- Arbor Type: Universal Arbor
- Quantity: 1-Piece
Approved Applications
- Cutting soft expansion joints
- Cutting window putty and sealing compound
- Cutting insulation materials
- Corner scraping in multi-material environments
Frequently Asked Questions
What materials is this sharp corner scraper rated to cut?
According to CMT product data, this blade is designed for cutting soft expansion joints, window putty and sealing compounds, and insulation materials. It is a multi-material blade suited to soft-to-medium consistency materials in those categories.
Will this blade fit my oscillating multi-tool?
The OMM21-X1 uses a universal arbor mount, which is compatible with most oscillating multi-cutters from a wide range of tool manufacturers. If your tool accepts a universal arbor accessory, this blade is designed to fit without a separate adapter.
What does the "sharp corner" blade style mean for my work?
A sharp corner scraper is shaped to reach directly into 90-degree corners and along edge joints - areas where flat or rounded blades leave residue or cannot fully contact the surface. This geometry makes it especially effective for cleaning expansion joint channels and scraping putty or sealing compound from window corners and similar recesses.
How deep can this blade cut?
The OMM21-X1 has a cutting height of 2 inches, allowing it to engage material at depth within joint channels or layered insulation without needing to reposition the tool as frequently as a shallower blade would require.
Reviews
FAQs
Standard Shipping is free on most orders over $50 within the contiguous US. If the order is under $50.00, the shipping is $9.99 set fee for shipping within the contiguous US.
Most of our products will ship within 1 to 3 Business Days. Some Special order products will ship within 2 to 5 Business Days. Preorders will be shipped to you on a first come first serve basis as soon as available from the manufacturer. Items that are "Made-to-Order" (Custom order products) will be shipped when fabrication is completed, shipping and delivery times will vary and depend on manufacturing.
Products that are shipped directly from the manufacturer will have processing and fulfilment times subject to manufacturer availability.
Preorders are shipped on a first come first serve basis as soon as available from the manufacturer, the sooner you place your Preorder the sooner your order will ship.
Freight shipping Policy:
Orders/Items too large or heavy may require special handling/Shipping and may require to be sent by truck. Someone must be present to accept truck deliveries. Standard truck delivery is to a dock facility designed to receive freight. You will be notified within 24 hours of ordering to confirm delivery. Lift gates for deliveries are available for an additional fee.
We offer Financing options through Clicklease
Please email your Return request to info@FactoryDirectSupplyOnline.com
Include the order number and the reason for your return.
All returns, regardless of their categorization, must include all original parts, be in their original packaging, and in the condition in which they were received. You may not qualify to receive a refund If the returned item is used, damaged, missing any parts, or is damaged during return shipping.
Checkout our complete Return policy
You can contact us through our contact page! We will be happy to assist you.